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Topic: Workshopping £1.40 Arduino-Compatible (£3.05 including USB!) (Read 5 times) previous topic - next topic

CrossRoads

I believe you need Clear to Send (input to the FTDI Basic,and not pulled Hi or Lo on the FTDI Basic board) connected to GND as well, lets th FTDI Basic know the slave device is ready to receive data.
May get erratic operation otherwise if left floating.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

cefn

Thanks for the heads-up, Crossroads. As mentioned earlier we're using a CP2102 in the place of an FTDI to save on cost. I don't know if the same is true of the CP2102. I'm using FTDI in the Fritzing diagram because the parts editor seems to be so buggy and problematic. At some point I'll have to edit a CP2102 part from scratch to make this diagram more accurate.

CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

cefn

I've updated the design to accommodate for...


  • The fact I can now get 16MHz Crystal and two 22pF Capacitors cheaper than a Ceramic resonator from Tayda Electronics

  • A perceived need for both rapid response and high capacity decoupling leading to 3 decoupling capacitors - from discussion with others, but could be overkill, so any other ideas are useful



The main benefit of this "Shrimp" design is the ease of transfer for those workshopping with 'Arduino compatibles' taking projects from breadboard-with-jumpers, through breadboard-with-length-cut-wires-and-components, to neat stripboard, meaning you can go from tabletop prototyping into something more robust without changing the circuit at all. This is something I hope will help delegates to the workshops.





I'm passing on the parts for these kits (including USB connectivity) for £5 now, which also covers my postage and handling costs. If you were to source these yourself, buying in the largest bulk volumes available, and barring postage costs (which tend to zero when you buy a million), you could make up Arduino-compatible component kits (including USB connectivity) for around £3.50

Get in touch if you're interested in sourcing these component kits for community workshops and I'll look into setting up something via eBay.

Now I need plenty of ideas for 'extension' kits which will be sets of components and code which permit the shrimp to be made into different things, like a "Milton Bradley" Simon game, a toilet-seat-not-down alarm, a Stylophone, and so on. Ideally only a couple of quid for parts for each extension kit. Really keen to see if this can help with the UK's transformation of it's ICT curriculum away from Microsoft and towards actual Programming.

Welcome your feedback. 

cefn

OK, eventually I noticed the Electrolytic capacitor was in the 'exploding' configuration. I've been post-processing the Fritzing diagrams in Inkscape to make the layouts more palatable, and had re-introduced an error. The Fritzing reference should be right, though.

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